Mysterious image on first boot lock screen

Question

I'm using Ubuntu 20.04 and noticed a weird behavior. When I select a wallpaper image, it is selected for both lock screen and background wallpaper, but on every first boot I see a mysterious image. I don't know where this is displayed from. Is a beach or something. I already checked my images on /home and even removed the wallpaper images from /usr, but the mysterious image is still there. How can I change it?

Answer 1

your situation is similar to this post Two different login screens on Ubuntu 18.10!

but instead of plain css file, it is using gresource file..

If you want to change the background keeping the Flat-Remix-Blue theme as it is, you need to manually extract the Flat-Remix-Blue's gresource file, edit the background as you wish and compile it back..

you can go through this post to understand the manual way How do I change login screen theme or background in Ubuntu 20.04?

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I have gone through the source code of flat-remix https://drasite.com/flat-remix-gnome

The better way is to reinstall the package again after replacing the background image from source and making the blur value to suitable value..

git clone https://github.com/daniruiz/flat-remix-gnome
cd flat-remix-gnome make && sudo make install

PKGNAME = flat-remix-gnome
MAINTAINER = Daniel Ruiz de Alegría <daniel@drasite.com>
PREFIX ?= /usr
THEMES ?= $(patsubst %/index.theme,%,$(wildcard */index.theme))
BASE_THEME ?= Flat-Remix-Blue
BLUR ?= 6
IS_UBUNTU ?= $(shell echo "$$(lsb_release -si 2> /dev/null)" | grep -q 'Ubuntu\|Pop' && echo true)